Year	Percent
1950	13.90194
1955	13.60217
1960	13.51721
1965	13.78811
1970	14.17347
1975	13.71034
1980	14.75829
1985	15.01116
1990	13.71597
1995	15.00331
2000	16.11163
2005	18.50983
2010	20.43784
2015	21.64146
2020	23.41414
2025	25.34988
2030	26.96467
2035	27.85341
2040	27.80329
2045	27.3481
2050	26.90941
2055	27.10714
2060	27.48347
2065	27.82428
2070	27.97558
2075	27.60849
2080	27.17933
2085	26.75092
2090	26.39346
2095	26.10454
2100	25.814